// Vite plugin: a virtual client entry that mounts the user's app. The
// user writes one isomorphic module; bankai generates the two lines of
// browser glue instead of asking for a second file.

export const CLIENT_ID = 'bankai:client'
const RESOLVED_CLIENT_ID = '\0' + CLIENT_ID

// the URL a browser uses to import the virtual module through Vite's dev
// middleware ('\0' encodes as '__x00__')
export const CLIENT_URL = '/@id/__x00__' + CLIENT_ID

export default function bankaiPlugin (entry) {
  return {
    name: 'bankai',
    resolveId (id) {
      if (id === CLIENT_ID) return RESOLVED_CLIENT_ID
    },
    load (id) {
      if (id === RESOLVED_CLIENT_ID) {
        return [
          `import create from ${JSON.stringify(entry)}`,
          'const app = typeof create === "function" && !create.mount ? create() : create',
          'app.mount(app.selector || "body")'
        ].join('\n')
      }
    }
  }
}